Multi-frequency polarimetric image of 1803+784. Panels (a)–(c) show the total intensity maps at bands A, C, and D in logarithmic scale, normalized to their peak. The dashed vertical line indicates the core position at band D, marking the core shift. Panel (e) displays all contours from the four bands superposed, along with the core and jet Gaussian models. Panel (f) shows the spectral index map (α). Panel (g) presents the rotation measure (RM) map. Only regions above 0.8% of the peak intensity are included.